(1又二分之一)+(-六分之五)+2又四分之三-(负八分之三)-(四又三分之二)

1,6/4+11/4+3/8+5/6-28/6
=17/4-23/6+3/8+34/8=37/8-23/6
=111/24-92/24
=19/24
0.33*(2.71-0.31)*2 －1.1
=0.33*2.4*2－1.1
=1.584-1.1
=0.484
-1/3-(-1+(1-0.33)/(-2))
=-1/3-(-1+0.67/(-2))
=-1/3-(-1-0.335)
=-1/3+1.335
=1.002
2a-[-3b+(4a-3a-b)]
=2a-(-3b+4a-3a-b)
=2a+3b-4a+3a+b
=a+4b
9m+[4m -3n-(2m-6m)]
=9m+(4m -3n-2m+6m)
=9m+4m -3n-2m+6m
=17m-3n